Black wifi discs

[Kevking27]

Just bought a single  white bt disc for extended wifi in my garage ( not on ring main, it has its own ) but after trying to connect it I read it needs to be always connected by Etherley, appreciate my fault for not thoroughly reading all forums , question is, if I get a black wifi disc once connected does it need a wired connection ( power supply is understood ) , should I just buy another white wifi disc which I believe doesn't need ethernet once set up or just switch providers 

[Keith_Beddoe]

You always need at least two white discs, as one always needs to be connected by Ethernet, to your router.

If you are a BT Broadband Customer with a Smart Hub 2, then the black discs can connect via wireless.

You cannot mix the black and white discs as they are not compatible.

[Kevking27]

Thanks Keith, the2nd white disc can be used in an external garage with NO ethernet cable needed?? Once paired, what's better in your opinion the 2 white or a black, it is withe super hub 2
Thx for your input

[Keith_Beddoe]

The white disc form their own wireless mesh, but cannot pair with the BT Smart Hub 2.

As for which is best, I have no idea, as I use a totally different system.